Steam-generator



(No Model.) 2 Sheets-Sheet 2.

P. J. ROBINSON.

STEAM GENERATOR.

No. 458,918. Patented Sept. 1,1891.

a e a Q m e a I Q Q a WHIWESSGEZD LWEWTOR I UNITED STATES PATENT OFFICE.

FREDERICK J. ROBINSON, OF DETROIT, MICHIGAN.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 458,918, dated September 1, 1891.

Application filed November 22, 1890. erial NO! 372,348. (No model) To all whom it may concern.-

Be it known that LFREDERICK J. ROBINSON, of Detroit, in the county of \Vayne and State of Michigan, have invented a new and useful Improvement in Steam- Generators, of which the following is a specification.

My invention consists in an improvement in steam -generators hereinafter fully described and claimed.

Figure 1 is an end View with the casing broken away, and Fig. 2 is a side elevation witha longitudinal central section through the casing.

A represents a jacket. of iron of suitable thickness, which is to be properly lined with a refractory non-conducting material.

B and B represent two steam and water drums made of iron plate or pipe of such size and thickness as is required by the size of the boiler and the pressure which is to be carried. These drums lie horizontally in the boiler near the upper part thereof and on each side.

C O represent vertical pipes whose upper ends are connected with the heads of the drum B near the lower part of said drum and whose lower ends are connected by a manifold D. The drum B is similarly arranged, the pipes C and D, Fig. 1, being counterparts of the pipes C and D.

E represents a series of coils of pipe which spring from the manifold D, rise vertically to sufficient height to form the fire-box, and then lead backward and forward over the grate Gby means of the return-bends F, and

finally tap into the lower part of the drum B. E represents a similar series of coils springing from the manifold D, alternating with the coils E, and connecting at their upper ends with the lower part of the drum B.

H represents a feed-heating coil, preferably of smaller pipe than coils E E, which lies over said coils E E, and which is connected at its inner ends with a feed-pipe 7L, into which water from the pump is forced. The feed-heating coil H leads to a mud-drum I, connecting with a blow-off pipe and drum J, from which a pipe 2 leads to the drum B. There may be two of these mud-drums I I, as shown in Fig. 1, in which case the mud drum I is connected with drum B and the mud-drum I with drum B ,or the feed-water may be all discharged from the coil II into a single mud-drum connected with both drums B and B.

K represents a steam-drum located above the feed-coil H, usually of somewhat smaller diameter than the drums B B, and itis con nected at one or both ends by the pipes L L with the steam-spaces of the drums B B.

M and N represent superheating-coilsleading, respectively, from opposite ends of the drum K, passing over the upper part of the boiler and uniting in a steam-pipe l.

P represents a gage-pipe connected at the top with the steam-space of drum B by pipe 0 and at the bottom with manifold D by pipe 0, and Q, represents an ordinary watergage.

R represents a steam-gage.

G represents the grate.

The operation of my invention is as follows: The boiler being filled with water to any desired point, which maybe the water-line(ind1 cated by dotted lines) in drums B B, or higher or lower, and a fire being built upon grate G, the water in the coils E E being db rectly over the fire andreceiving the most intense heat becomes heated and rises in said coils, discharging into the drums B and B, respectively. As fast as the water rises 1n the coils E E water descends in the large pipes C C from the drums B B, passes into the manifolds D D, and then upward through the coils E E as before, thus maintaining a free and uninterrupted circulation. The heat, after passing through the coils E E, rises through the feed-coil H, striking against the drums B B, then around the steam-drum K and through the superheating-coils M M, and finally passes out through the openlng A of the jacket into the stack. Feed-water forced into the T 7L passes through the feedcoil If, becoming heated, then into the mud drum 1 or drums I I, where its current becomes feeble and drops the mud, and then is discharged into the drums B B at a point as high as or higher than the T 71/. The steam which is separated in the drum B B passes through the pipes L L to the steam-drum K, where what little water is carried with it separates therefrom and is evaporated in said drum, from whence the steam passes through the superheating-coils M M to the steampipe It is evident that the mud-drum I, or, if two are used, the mud-drums I I, may be placed without the shell A, if it is desired to keep them away from the effect of the fire.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a steam-generator, the combination of two steam and water drums with a manifold beneath each drum and connect-ed with the ends thereof, coils alternately connecting each manifold with the opposite drum, and afeedheating coil lying between the drums over the heating-coils, substantially as shown and described.

2. The combination, with two water and steam drums, each connected by downpipes with a manifold, and a grate lying between said manifolds, of coils of pipe springingalternately from said manifolds and connecting each manifold with the opposite steam and water drum, a feed-coil lying between said steam and Water drums, and a mud-drum contherewith, a steam-drum between said steam and water drums connected with the steamspaces thereof, and a superheating-coil above the feed-coil and connected with said steamdrum, substantially as shown and described.

FREDERICK J. ROBINSON.

Witnesses;

CHARLES L. CoFFIN, GERTRUDE H. ANDERSON.

coil lying between said drums and connected 

